Gingko nut irregularity

As I walked past Manhattan School of Music, I noticed the familiar stinky smell--the smashed gingko nuts on the streets. It is already that time of the year when the trees become yellow and start shedding their leaves and nuts. I accidentally stepped on the nut (ugh), and noticed that the nuts were fallen (and smashed) in irregular way: There were rows of gingko trees on 122nd street, but while some nuts were spread reasonably (randomly and spread out), one tree had concentrated spots of the smashed gingko nuts. Isn't nature supposed to be random? Is there a causality (for why I stepped onto that concentrated spot of smashed gingko nuts?)